P0043 Nissan Code - Heated Oxygen Sensor 3 Heater Control Circuit Low
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0043 Nissan indicates Heated Oxygen Sensor 3 Heater Control Circuit Low.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0043 Nissan Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0043 Nissan?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0043 Nissan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0043 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0043 Nissan Code
No Frequently Asked Questions about P0043 Nissan Code found.
Discuss the causes and fixes for P0043 Nissan OBDII Code
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What part? sensor or the fuse? What model and year is your Nissan? every model have the sensor and fuse on different location.
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The P0043 code is for the "Oxygen Sensor 3". The"Oxygen Sensor 3" is the last O2 sensor in the exhaust system.
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Thanks for the pictures. I replaced the sensor and light came back on same code p0043. I checked with a test light for voltage at plug and also checked the one 02 sensor fuse I found under hood. All seemed to be ok.
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I replaced the sensor and light came back on same code p0043. I checked with a test light for voltage at plug and also checked the one 02 sensor fuse I found under hood. All seemed to be ok.
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Check if you have battery voltage at the Pin #2 of the connector. Use a volt meter an not a test light. If you do have battery voltage check the sensor as shown on the image below. If you do not have battery voltage, the the wire is damage between the sensor and Engine Control Module.
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how much voltage should I have at the wiring harness? regular battery voltage?
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I have 11.1 volts at the harness and have 4 ohms between 2,3 on the 02 sensor.
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Yes, whatever the battery voltage is.
If the sensor is OK and there is battery voltage at pin #2 (tested with sensor disconnected), then the next step is to check the wire from the sensor connector pin #3 (test with sensor disconnected) and the ECM. If the wire is OK, then the problem is the ECM. -
Only thing I can give you is that the wire is "Blue" and that is the "Pin #17" at the ECM connector.
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Ok so all checks out fine. During the test drive all I/m cleared and set to ok around 10 miles. Once I hit 13 miles the light came back on for p0043 again. I did monitor the drive and o2 sensors seemed to be working. cat temp reached 750 or so. Any further info would be great before I purchase a new ecm.
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Any exhaust leaks? If no leaks are present, then my best guess is that you have a bad sensor.
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Doesn't have any exhaust leaks and I did replace the sensor 3 first off. I also have tested it and it is good. is it possible for the p0043 code to be tripped from a different o2 sensor?
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I have a 2008 Nissan Rogue. What is the location of the B1S3 oxygen sensor? Is it upstream or downstream? Also is there a specific part number?
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Unfortunately, I don't have the part number. Here is the only image I got of the sensor location:
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